Vocabulary
Conclusions based on observations, previous knowledge, and available information.
What is inference?
Hypothesis
What is a possible, testable explanation of an observation?
Science is a system of knowledge and process used to find that knowledge.
What is science?
Substances that have a fixed composition.
What are pure substances?
electrons that are in the highest energy level of an atom.
What us Valence electrons
Compounds made of only two elements.
What are binary compounds?
Observation made using the 5 senses.
What is qualitative observation?
Scientific Law
What is a well supported description of a natural phenonmenon?
Name the following observation as qualitative or quantitative.
It is light blue in color.
What is qualitative?
The energy an object has due to its motion.
What is kinetic energy?
A compound with 1 zinc atom and 2 chlorine atoms have what chemical formula?
What is ZnCl2
The time rate of change of an object's velocity.
What is acceleration?
The state of matter with a definite shape and a definite volume.
What is solid?
Gas
What is the state of matter in which a substance has neither a definite shape nor a definite volume?
Name the following observation as qualitative or quantitative.
It is 8.3 centimeters.
What is quantitative?
True or False
200 grams of silver has greater density than 600 grams of aluminum.
What is true?
Most of the mass of an atom is found here.
What is the nucleus?
Distance divided by time.
What is speed?
The force of attraction between molecules of the same substance so that they tend to stay together.
What is cohesion?
Displacement
What is the distance an object travels plus the direction from the starting point?
All the factors that might change in an experiment.
What are variables?
Butter melting is a _____________ change.
What is physical?
True or False.
An electron cloud represents all the orbitals in an atom.
What is true.
____________ is always present as a reactant in combustion reactions.
What is Oxygen?
The number of protons in an atoms.
What is atomic number?
Mass Number
What is the sum of the protons and neutrons in the nucleus of a cell?
Give me the name and symbol for the following base SI unit.
Mass
What is kilogram, kg?
True or False
Chemical changes do not produce new substances.
What is false?
H2O
What is water.
The substances that are present before a reaction takes place.
What are reactants.